I'm a CS student. currently I'm involving my self project to develop a website. there I'm gonna provide free service Doc (word,ppt,xls..etc) to PDF conversion and also provide PDF to Doc(word, ppt,xls..etc). but I dont have any idea about this. Before I google it I just wanna put a thread here because you peoples are helped me a lot before.so I'm expecting the same now.. please gimme your suggestion to develop my site.